No autozoom after tap on input filed

No autozoom after tap on input filed

blink::WebViewImpl::computeScaleAndScrollForFocusedNode calculates a new scale
for text in editable fields to be legible. However, there is a constraint
m_maximumLegibleScale which is by default set to 1 preventing setting a newly
calculated scale which is usually larger than 1.

Enlarge maximum legible scale for Tizen to allow auto zoom after tap.

Additionally, call ScrollFocusedEditableNodeIntoRect regardless of im_context_
in order to have it for non virtual keyboard (desktop) builds.

Do not scroll and zoom autofocused elements unless IME is expected to be shown.

This is squash of two beta/m42 patches:
1. http://web.sec.samsung.net/gerrit/#/c/84212/ reviewed by
Antonio Gomes, Janusz Majnert

2. http://web.sec.samsung.net/gerrit/#/c/88233/ reviewed by:
Antonio Gomes, DONGJUN KiM:

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=14586

Reviewed by: a.renevier, a1.gomes, sns.park

Change-Id: I0aad6a6fb0ee3a17f15b7c8bd0785ad4e1c0f145
Signed-off-by: Grzegorz Czajkowski <g.czajkowski@samsung.com>